Calibrating device for speed-indicators for talking-machines.



c. E. wsons. v GALIBRATING DEVICE FOR SPEED INDICATORS FOR TALKING MACHINES.

APPLICATION FILED AUG. 30, 1913.

127,569. Patented Feb. 9, 1915.

PATEN onricn.

CLINTON'E. WOODS, F BRIDGEPORT, CONNECTICUT, ASSIGNOB TO AMERICAN GRAPHO- PHONE COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF WEST VIRGINIA.

CALIBRATING DEVICE FOR SPEED-INDICATORS FOR TALKING-MACHINES.

Specification of Letters Patent.

Patente'd Feb. 9, 1915.

7 Application filed August 30, 1913. Serial No. 787,462.

To el I whom it may concern:

c t known that I, CLINTON E. Woons, of Bridgeport, Connecticut, have invented .a new and useful Improvement in Calibrating Devices for Speed-Indicators for Talkingdllachines, which invention is fully set forth in the following specification.

"ihe present invention relates to speed in dicators for talking machines of the charac terset forth in my application Serial No. T70R17, filed May 29th, 1913, and has for its object to provide a simple, correct and edective means for calibrating the speed. in dicator, to the end that the indicating neee'lle of. the speed indicator shall correctly and accurately indicate on the scale the enact number of revolutionsper minute imparted to the record supporting turn-table by the motor.

it is of the highest importance in the tall:- ing machine art that the operator should be able not only to adjust or control the speed of the motonbutthat he should he advised by the speedometer as to the exact number of revolutions per minute imparted to the record, since it is highly desirable that the record in the act of reproduction should be driven at the same speed as was the record tablet when the sounds were originally recorded.

by the action of a sliding element under the influence of centrifugal force, and the present invention has to do with the calibration of said sliding element with relation to the needle and the parts turning therewith, to the end that the needle acting incooperation with the scale shall correctly indicate on the scale the number of revolutions imparted to the record bythe motor. 0

Broadly stated, the 1nvent1on consists in an indicating needle and a centrifugally operated device connected to the motor, and an adjustablepart on one of these elements (preferably the needle or. parts connected therewith) for accurately fixing the relation between the parts, to the end that when the motor is driving the record at a' given number of revolutions per minute, the centrifugally operated device shall move the needle so that it will indicate on the scale the precise number of revolutions which the motor is unparting' to the record. This is a delicate operation in the speedometer of my application Serial N 0. 770,717, and the present invention has particularly in view to facilitate such adjustment between the relation of the parts, to the end that the workman may quickly and readily elfect the adjustment and at the same time procure an adjustment of great accuracy.

The inventive idea is capable of receiving a variety of mechanical expressions, one of which, for the purpose of illustrating the invention, 1s shown in the accompanying drawings, but it is to be expressly understood that such drawings are for the pur pose of illustration only and not for the purpose of defining the limits of. the invention, reference being had to the appended claims for this purpose.

In said drawings :-F igure 1 is a side elevation of a talking machine with my invention applied thereto; Fig. '2 is a perspective view of the indicating needle and its mount ing, .together with the centrifugally actuated element for effecting the turning movement of the needle.

In said drawings, in which like reference numerals indicate like parts, 1 is the governor shaft integral with or o'perativcly connected to'the motor shaft 2 of a motor 3, said shaft 2 being provided with a worm 4 which transmits motion to the vertical shaft 5 on which is mounted the turn-table 6 which supports the sound record. 011 the hub connected to the governor shaft are two radial bracket arms 19, in which are pivotally mounted two bell-crank levers 20-20, having two weights,22-22 at theirouter ends and with their inturned ends engaging the flange end of a sleeve 23 slidably mounted onithe governor shaft 1. Under the action of jcentrifugaloforce the inturned ends of the levers'20 slide the sleeve 23 along the shaft 1 against the tension of spring 24 reacting against such sleeve and a' suitable abutment on the shaft. Adjoining said spring 24, the sleeve 23 is provided with an annular flange 25. On a vertical shaft 26 turning in suitable bearings in the frame of the machine is mounted a. needle arm 27, .whose end is adjacent to a scale 27. Said shaft 26 is provided with a horizontally projecting arm 28 adjacent to or in the path of the flange 25 on the sleeve 28, when the latter is acted upon by centrifugal force to 'cause it to move along the shaft 1 and compress the spring 2%. This arm 28 in the present invention is in the form of a pin turning in an opening passing through the shaft 26, the pin being fixedly secured in position by means of a set-screw 29. Mounted upon said pin 28 is a lug 30, the same constituting, in the present invention, the part which lies in the path of the flange 25 on the sleeve 23, and the particular and specific object of the present invention is to so adjust the relation between. the part 30 on the pin 28 and the flange 25 on the sleeve 23 that at any given speed of the turn-table the needle 27 shall point to a corresponding speed on the scale. 31 is an arm secured to the shaft 26 and having a spring 32 connected thereto at one end, the other end .being connected to an arm 33 secured to the frame of the machine, which spring acts normally to return the needle to the position which it occupies when the motor is at rest.

Since in talking machines of ordinary construction and operation, it is only desirable to indicate the operation of the parts for a small. number of degrees above or belowthe desired operation, the scale usually employed onl "cates a variation of about ten degrees, an this being the case it is unnecessary and therefore undesirable that the speed indicator should begin to operate be-. low, say, seventy-five revolutions of the turn-table per minute. The number of revolutions now generally accepted as a standard is eighty revolutionsper minute. Therefore,,in the present instance I have shown a scale indicating from seventy-five to eightyfive revolutions of the turn-table per minute, and with such a scale it is only desirable that the speed indicating needle should begin to move. or operate when the turn-table has reached a speed of seventy-five revolutions per minute. For this reason the pin 28 passing throughthe shaft 81 is turned so as to bring the lug 30 into a position where it will be contacted by the flange 25 on the sleeve '23, when the turn-table is moving at seventyfive revolutions per minute. The motor is then speeded. -up to say eighty revolutions per minute, and it is noted Whether or not the indicating needle 27 points to the figure 80 on the scale. It may point above or below such figure. If it points above, it is because the shaft 26 and with it the needle 27" has been turned through too great an angle, and this is due to the fact that the pin 28 has been turned through too great an "anglea table is moving at eighty revolutions, it is because the needle, the shaft, and the pin 28 have not moved through a sufiicient angle, and, therefore, the angle should be increased, and this is accomplished by loosening the set-screw 29 and pushing the pin 28 farther in, so as to bring the lug 30 nearer to the shaft 26.

hat is claimed is j 1. In a. speed indicator for talking machines, the combination of a motor-driven centrifugally-actuated element with a speedindicatingneedle actuated by said element, and means adjustable in two planes with respect to said element for calibrating the 0perative relation between said element and said needle.

2. In a speed indicating mechanism for talking machines, the combination of a motor-driven centrifugally-actuated element and an indicating needle mounted on a revoluble shaft, a pin projecting radially from said shaft and bearing apart in operative relation with said centrifugally-actuated element, said pin being adjustable radially of said shaft.

3. In a speed indicator for talking machines, the combination of a motor-driven centrifugally-operated element, an indicating needle mounted for angular movement and having a part connected thereto in the path of said centrifugally-operated element, and means adjustable in two planes with respect to said element for calibrating the relation between said needle and said lastnamed element.

4. In a speed indicator for talking machines, the combination of a motor-driven centrifugally-operated element with a speedindicating needle mounted on a vertical shaft, and a contact arm projecting radially from said shaft and having a part in the path of said centrifugally-operated element and capable of adjustment radially to said shaft and in a vertical plane parallel with said shaft.

5. In a speed governor for talking machines, the combination of a motor-driven oentrifugally-operated element with an indicating needle mounted to turn about a given axis, and a contact lug or part moving with said needle about its axis, said contact part -or lug being capable of adjustment' in a plane parallel With said needle and alsdin a plane vertical to or normal to the line of movement of said needle;

6. In a speedometer fortalking machines,

memes the combination of a speed-indicating needle, a revoluble vertical shaft to which said needle is keyed, a contact lug, a pin supporting said lug and connected to turn with said needle, said pin being capable of adjustment in a line radial to said shaft and also of turning around its own axis, means fixing the pin in any adjusted position, and a motor-driven centrifugally-operated device in operative relation with said contact lug. I

7. In a speedometer for talking machines, the combination of a motor-driven shaft, a sleeve mounted to slide on but revolve with said shaft, a centrifugal device for imparting sliding movement to said sleeve, a speed indicating needle revoluble. around an axial ax s, means securing said pin'in its adjusted position, and a contact lu'g carried by said pin in the path of said sleeve when the parts are in operation.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

CLINTON E. WOODS.

lVitnesses:

JOHN R. Pn'mm, JOHN S. GRIFFITH. 

